This is really humiliating to admit, but I got the tkc handle scales set today for the 4, and I can't do the installation. I have two of the correct hex key, but even tightening the screws from both sides one generally won't engage the threads. It's been a long three hours of fussing and sweating over it, and now my back hurts too bad from stooping over the workbench to continue. At one point I managed to get two of the screw sets in and tightened but the scales weren't lined up right and I had to start over. I'm thinking I may have to search around for someone better than me to hire out to do the job for me, or else try to cord wrap my 4 cause I can't get the stock scales back on either. 
